Valve-grinding machine



Sept. 30. 1924. 1,510,006

E. F. KIESTER VALVE GRINDING MACHINE 2 Sheets-Shee t. 1

Filed Nov. 4, 1922 Sept. 30,1924. 1,510,006

E. F. KIESTER VALVE GRINDING MACHINE Filed Nov. 4, 1922 2 Sheets-Sheet 2 Eatented Sept. 30, 1924.

"UNITED STATES PATENT OFFICE.

VALVE-GRINDING MACHINE.

' Application filed November 4, 1922. Serial No. 599,054..

To all whom it may concern:

Be it known that I, EVERETT F. KIESTER, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Valve- Grinding Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such. as will enable others skilled in the art to which it appertains to make and use the same.

My invention provides an improved machine especially adapted for the grinding of poppet valves,'such as generally used in internal combustion engines, and, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

This improved machine has been designed especiallv for use in gara es, auto repair shops, and the like, but, of course, is capable of use wherever it mav be found serviceable.

In the accompanying drawings, which illustrate the invention, like characters indi cate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a side elevation of the improved grinding machine;

Fig. 2 isa front elevation thereof;

Fig. 3 is a detail showing in section the valve-holding chuck, a valve head held thereby being shown in full;

Fig. 4 is a section on the line 4-4 of Fig. 3; a

.Fig. 5 is a plan view of the machine;

Fig. 6 is a plan view with some parts broken away, showing particularly the valve-adjusting. and moving elements of the machine, said parts being shown on a much larger scale than in the other views; and

Fig. 7 is a view showing certain parts of the machine in vertical section and other.

parts in front elevation, some parts being broken away.

The various parts of the machine are mounted on a base 8, which is preferably a hollow cast structure having a fiat top, on

which is mounted a large bearing pedestal 9 and ease ther-b a n s he ei m b noted. At'one side, the top of the base 8 is formed with a transverse slot 10 that affords a runway for a carriage 11, the outer end of which is turned downward to form an arm 12. A retaining plate 13, secured by screws or the like to the bottom of the car riage 11, underlaps the bottom of the top plate of the base 8 and holds the carriage for movement in a true horizontal plane. A long feed screw 14, that extends parallel to the runway 10, has threaded engagement with the base 8, (see particularly Figs. 5

latory bearing in the form of a turret'17 is swiveled to the carriage 1,1 for rotary movements on a vertical axis. As shown, this turret 17 has a reduced portion mounted in a seat in the top of the carriage 11 and has countersunk segmental slots 18. Machine screws 19 are passed through the slots 18 with their heads below the upper face of the turret and with their threaded ends screwed into the carriage 11. The turret 17 is provided with diametrically opposite bearing lugs 20 through which project and to which aresecured parallel guide rods 21.

Mounted to slide on to of the turret 17 is a bearing plate 22 that has diametrically opposite bearing lugs 23 and transversely spaced pairs of bearing lugs 24. The bearing lugs 24 are arranged to straddle the lugs 20 of the turret 17 with very considerable clearance and are arranged to slide on the ends, of the guide bolts 21. A grinding spindle 25, shown as provided with conical ends, is journaled in bearings 26 secured in the bearing lugs 28. This spindle 25 carries a grinding wheel 27, of carborundum or other suitable abrasive material, and also carries a sheave or grooved pulley 28. Said bearing plate 22 is formed with segmental slots 29 that follow but are larger than the slots 18 and the turret 17. The slots 29 afford access to the heads of the screws 19, so that the latter, by means of a screw driver, may be tightened or loosened, at will, in the various different adiustments of the turret, bearing .to the valve.

plate and parts carried thereby. The connections just above described, it will be understood, of course, cause said bearing plate to partake of all of the rotary adjust ments of the turret, but permit said bearing plate to slide or reciprocate on the guide bolts 21.

For imparting the reciprocating movements to the bearing plate 22 in respect to the turret, I provide a rack bar 30 and cooperating gear segment 31. Said rack bar is rigidly secured to the two adjacent bearing lugs 24, (see particularly Figs. 5 and 6), and the gear segment 31 is journaled to an arm 32 that projects from the turret 17. For manually operating the gear segment 31, it is provided with a projecting handle 33.

In Figs. 1, 3 and 5, the character 3 inclicates an ordinary poppet valve, such as used in internal combustion engines, both for admission and exhaust purposes. For" holding this valve in position for grinding and for rotating the same on the axis of its stem, 1 provide on the base 8 upstanding bearing brackets 34 through the upper portions of which the valve stem may be inserted with freedom for rotation. The valve stem is also telescoped under friction thr ugh a tubular chuck 35, one end of which is longitudinally and radially split to afford the desired frictional contact. A grooved driving pulley or sheave 36 is then frictionally telescoped onto the chuck 35. A spacing sleeve 37, see Fig. 5, telescoped onto the valve stem, holds the valve head a constant distance from the adjacent bearing bracket 34. One end of the chuck 35 may be moved against the same bracket, thereby holding the valve head free for rotation but against axial movement.

I have shown manually operated means for rotating both the grinding wheel 27 and the valve 3 the former at a relatively high and the latter at a relatively low speed. This means, as illustrated, comprises as follows: A large friction wheel 38, equipped with a driving crank or hand piece 39, is securedto a shaft 40 journaled in the intermediate portion of the pedestal 9 and provided at its extended end with a grooved driving pulley orsheave 41. Abelt 42 runs over the pulley 41 and over the chuck pulley 36 to impart the relatively slow rotation The periphery of the friction wheel 38 runs in contact with a friction pulley 43 carried by the hub of a large grooved pulley 44 mounted on a stud 45 secured to and rojecting from the upper end of the pedestal 9. A belt 46 runs over the pulley 44 and over the grooved pulley 28 on the grinding Wheel spindle25 The connections just noted will impart the relatively high speed to the grinding wheel 27. 7

The use and operation of the grinding machine above described are probably obvious but may be briefly described as follows:

The valve is placed in position for grind ing in a manner already clearly described. hen the screws 19 are loosened, the turret 17 may be oscillated so as to set the axis of the grinding wheel 27 at the proper angle for grinding the particular valve, which angle is usually at 90, but frequently varies. By rotating the feed screw 14, the face of the grinding wheel can be set in the proper po sition for grinding the valve and when the wheel is thus set, it may be rcciprocated on the line of its axis of rotation. By mani 3ulations of the lever or hand piece 33, which causes the bearing plate 22 to reciprocate on the guide rods 21, the grinding wheel can be moved to and fro over the face of the valve. By these several adjustments and movements, valves may be quickly ground to very true form and at very small expense. The device has been found efficient for the purposes above stated or suggested.

What I claim is:

1. A valve grinding machine comprising a base, a carriage slidably mounted on said base, manually operated means for adjusting said carriage, a turret rotatively mounted on said carriage, means for locking said turret to said carriage in different angular adjustments, said turret having diametrically opposite bearing lugs, a bearing plate connected to the lugs of said turret for straight line reciprocating movements, a grinding wheel having a spindle extended parallel to the reciprocating movement of said bearing plate and journaled in bearings on said plate, means for rotating said spindle and grinding wheel, means for imparting straight line reciprocating 1novements to said bearing plate and parts carried thereby, said means comprising a rack secured to said bearing plate, an arm projecting from said turret, and a hand operated gear journaled to said arm and meshing with said rack.

2. In a valve grinding machine, the combination with a base, of a carriage slidably mounted on said base, means for slidably adjusting said carriage, a turret rotatively seated on said carriage and having segmental slots, screws passed through said slots and screwed into said carriage for securing the said turret in different angular adjustments, a bearing plate mounted on said turret and having segmental slots through which said screws may be reached, the said plate being movable above said screws, said turret having diametrically opposite lugs and a projecting arm, parallel guide rods mounted in the lugs of said turret and engaging lugs on said bearing plate and thereby supporting said bearing plate for straight-line movements, diametrically 0pposite upstanding bearing arms on said bearing plate, a grinder spindle equipped with a grinding wheel and a pulley and journaled in the diametrically opposite lugs of said bearing plate with its axis parallel to the said guide rods, a belt running over the pulley on said spindle, means for driving said belt, a rack secured to one side of said bearing plate, and a handle-equipped gear segment pivoted to the arm of said turret and meshing with said rack.

In testimony whereof I afliX my signature.

EVERETT F. KI-ESTER. 

